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Bears on natural selection — The term used in a wide sense— Geometrical
powers of increase — Rapid increase of naturalised animals and plants— Nature
of the checks to increase — Competition universal— Effects of climate ...
Present distribution cannot be accounted for by differences in physical conditions
— Importance of barriers — Affinity of the productions of tho same continent —
Centres of creation — Means of dispersal, by changes of climate and of the level
Naturalists continually refer to external conditions, such as climate, food, &c, as
the only possible cause of variation. In one very limited sense, as we shall
hereafter see, this may b6 true ; but it is preposterous to attribute to mere external
When we reflect on the vast diversity of the plants and animals which have been
cultivated, and which havo varied during all ages under the most different
climates and treatment, I think we are driven to conclude that this greater
variability is ...
Habit also has a decided influence, as in the period of flowering with plants when
transported from one climate to another. In animals it has a more marked effect ;
for instance, I find in the domestic duck that the bones of the wing weigh less ...
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